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Your child's first diagnosis might be hiding a second one
💡 An existing diagnosis can mask a second condition — always ask whether something additional might be going on.
When a child already has one diagnosis — say ADHD — something sneaky can happen. Doctors and teachers start explaining everything through that lens. Trouble with friendships? "That's the ADHD." Meltdowns at school? "ADHD again." This is called diagnostic overshadowing, and it's one of the most common reasons children's needs get missed.
Diagnostic overshadowing happens when an existing diagnosis "shadows" the signs of a second condition, making them invisible. A child with Down syndrome might also have autism, but their social differences get chalked up to intellectual disability. A child diagnosed with anxiety might actually have an unrecognized sensory processing difference driving the anxious behaviors.
The risk is real: research suggests that children with one developmental diagnosis are actually more likely than average to have co-occurring conditions — yet they're often less likely to be evaluated for them. The first label becomes a stopping point instead of a starting point.
What can parents do? If your gut says something else is going on, trust it. Ask the specific question: "Could there be something in addition to the current diagnosis?" A good clinician won't be offended — they'll welcome the chance to look deeper.